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Showing results for tags 'cracked'.
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Just wondering if anyone has encountered this issue. I have well tempered core-lite kiln shelves (26" rounds) I use at the base of my kilns. Just recently we started do fast low fire firings to set underglaze. The last two fires we lost the bottom shelf (bottom shelf only). I'm attaching photos. We've been using the same pack pattern for more than 2 years including a 3 post lift to the next shelf without issue. None of the other kilns have manifested the issue, but this is the only one we've been running fast fires to ^05. I'm thinking the speed of the fire has something to do with it, but that's only a theory. We have run fast fires to the same ^05 on the same program in our 18" kiln with 18" full rounds without incident. We've been doing this for more than 2 years. The first time it happened (yesterday), the shelf was older, about 3 years old. I would say approximately 200+ firings on it. My first suspicion was that some sort of fatigue had occurred. So, I replaced it with a kiln that was less than 6 months old and had less than 50 firings on it. On the very first firing the exact same fracture occurred. No shelves above the bottom shelf fractured or cracked. All had the same post layout, and all posts were directly above one another. The first time it happened there were only 2 full shelves above the bottom shelf plus one lightly loaded (3rd shelf). The second time it happened there was one single fully loaded shelf above bottom shelf. The types of pots, loads, and weights per shelve were identical in the two firings. After the first shelf fractured I added four (1) 1.5" x 1.0" posts around the center of the bottom shelf for additional support. If there are any clarifying questions I can respond here, thoughts and suggestions are welcome... Mike
Turquoise stone and white matte ^6 ox on calico dark red clay. A couple very wonky vases that developed decent sized cracks from uneven drying, this was one of the first things I made after taking a hiatus of 3 years from clay, be gentle! I needed to keep a few unsatisfactory pieces to try my experiments. I am totally head over heals in love with the color combo, but am very sad all the pieces developed pin holes on them... I talked to the professor and she is going to go over how to avoid that next time and keep my work together as to have a more consistent firing.
Hi, I am new in this forum and I am here to learn from you guys. I started playing with terracotta clay and I love to work with it. I am trying to make a very thin (about 1/16") uniform rectangular sheets. They are about 5"x6". After I take out the air bubbles I cut with a fine steel wire the sheets and place them on a thick steel flat surface dressed with a very fine oil film. I cover them with an acrylic sheet with some weight on it to keep them flat (very important) for a few days. Then, when they are easy to handle I found first they are bent or curved up and cracked and I can't burn them that way. Please tell me what I am doing wrong if not all. Thanks.